Preauricular fistulas are usually caused by congenital underdevelopment and can be improved by surgery with a success rate of 99%. In adults, preauricular fistula surgery can be performed under local anesthesia, under a microscope, using a shuttle incision to separate the fistula in the direction of travel, and if there is granulation tissue, it can be removed together with postoperative suturing of the wound. However, if the patient has a large number of fistula branches and multiple infections, there is a possibility of postoperative recurrence. If you want to improve the success rate, a small amount of methylene blue can be injected at the time of preauricular fistula excision to help identify the exact extent of the fistula intraoperatively. It is usually necessary to wait 3-6 months after the fistula has been drained and inflamed before proceeding with surgery, as there is a high risk of recurrence if the surgery is not able to completely remove the fistula in the presence of inflammation, or if the area removed is not large enough. Anti-inflammatory treatment is required after surgery for preauricular fistula, short-term application of hemostatic drugs, attention to sleep on the side as much as possible, avoiding water on the surgical site. The actual fact is that you will need to pay attention to a light diet, avoiding spicy and irritating foods, and it is recommended to consume more meat and high protein foods to increase nutrition.